Furnace



G. H. HESS.

FURNACE.

APPLICATION min JuHEz. 1920.

Patented Nov. 9, 1920.

- 3 SHEETS-SHEET 2.

G. H. HESS.

FURNACE.

APPucATloN FILED JUNEzs. 1920.

1,358,370. Patented Nov. 9, 1920.

3 SHEETS-SHEET 3- :of the jacket 11 at opposite sides of the channel 17, it being preferred thatV the joint'between the plate 19 and the wall of the combustion chamber 8 be practically gas-tight. The structure just described forms a flue which is locatedV within. the hot-air space 12 and through which the hot products of combustion are caused to pass, in the normal operation of the furnace on their V.way to the outlet of the furnace vwhich communicates with the usual smoke-pipe, thereby Vaugmenting the heating of the air in its passage through the air space 12, the products of combustion in the operation of the furnace as stated,` entering the flue through the opening, represented at 21 and which, in the particular construction illustrated, is formed by the plate 19 reaching short of the bottom portion of the Ychamber 8.

VThe plate 19 toward its upperend, and

Vin the position shown in the drawings slightly above the upper edge of the fireboX 9, contains an opening 22 arranged substantially in line with openings 23 and 24, in the wall 18 of the flue and the rear wall of the jacket 11, respectively, there being provided in the opening 24 and connected with the wall 18, to register with the opening 23 and tov form a gas-tight connection with the said wall, a pipe 24L through which the products of combustion are conveyed away from the furnace. The opening 22, in cooperation with the other parts just described, forms a direct passage for the productsV of combustion from the ,combustion chamber to the outlet of the furnace. Damper means are illustrated for controlling the opening and closing of this direct passage, these'means, as shown, comprising a tubular member 25 shown as cylindrical and containing offset lugs 26 and 27 on its inner surface, this member being riveted as indicated at 28, or otherwise suitably secured, to the outer surface of the plate 19. Cooperating with the opening provided through the member 25 is a damper 28 shown in the form of a disk with portions thereof deiiected in opposite directions into angular position as represented at 29 and-30 and through which deflected portions a pivot pin 31, square in cross section, extends, its upper and lower circular extremities being journaled in the member 25. A plate 32 extends through a slot 33 in the damper 28 and contains a square hole (not shown) through which the pivot pin 31 extends and with which it is interlocked to permit the damper 28 to Vbe-turned by swinging `the plate 33which contains at its outer end an elongated slot 34 into which a depending arm 35 rigid on a'bar 36 rotatably mounted in the plate 19, wall 18 and rear wall of the jacket 11, extends'. The outer end of the shaft 36 has a crank arm 37 pivotally connected with a link 38 connected with a crank arm 39 on a shaft 40 journaled in brackets 41 on the jacket 12, the opposite the mechanism described, move the damper 28 to open condition, and when this door is swungfto closed position will close theV damper 28.

The iue formed by the closed channel 17, is preferably provided with a damper represented at 46 and shown in the form of a plate-mounted on a rock shaft 47 journaled in openings in the plate 19, wall 18 and rear wall of the jacket 11, the outer end of this rock shaft havingV a handle portion 48 by which the damper may be set in any desired position in the flue.

It will be understood that in the normal operation of the furnace the passage, controlled by the damper 28, is closed to the combustion chamber and consequently the products of combustion are forced to pass to the inlet 21 of the iiue through which latter they pass upwardly to' the outlet of the furnace, the hot products of combustion thus being required to pass through an indirect path on their way out of the furnace and in passing through the flue formed by the closed channel 17, serve to provide increased heat-radiating surfaces for contact by the air in the air space 12, thereby augmenting heating action on the air and thereby utilizing to a high degree, the heat units for heating the air to be delivered from the furnace. Then the fire door 16 is opened the damper 28 is automatically opened and a direct passage for the products of combustion from the combustion chamber 8 to the outlet of the furnace, is provided.

A very desirablefeature of my construction consists in forming the Hue located in the air space 12, by deiecting laterally in an outward direction, the metal of the wall of the combustion chamber, inasmuch as not only may the furnace be economically constructed, but danger of escape ofthe gases from the combustion chamber into the air passage, is eliminated as this part of the structure is free of joints between the passages -through which the products of combustion pass andthe air space, it being observed that the joints between the plate 19 and the walls of the channel 17, are located between passages both of which are traversed by products of combustion, viz., the combustion chamber and the iiue.

While I have illustrated and described a particular construction embodying my invention, I do not wish to be understood as intending to limit it thereto, as the same may be variously modified and altered without departing from the spirit of my invention.

What I 'claim as new and desire to secure by Letters Patent is:

l. In a hot-air furnace, the combination of a combustion chamber, a jacket between which and the wall of said chamber a hotair space is provided, the wall of said chamber being deflected laterally to form a channel, a plate secured to the wall of said chamber to form, with said'deflected portion, a flue in said hot-air space, said flue containing openings at different elevations communicating with said chamber and the furnace being provided with an outlet communicating with said flue, the upper opening in said flue forming a passage from said chamber to said outlet for the relatively direct travel of the products of combustion from said chamber to said outlet, and the lower opening in said flue forming a passage for the relatively indirect passage 0f said products to said outlet, and means whereby the products of combustion, under the control of the operator, may be per niitted to pass through either the upper or lower opening` in said flue.

2. In a hot-air furnace, the combination of a combustion chamber, a jacket between which and the wall of said chamber a hot'- air space is provided. the wall of said cham ber being deflected laterally to form a channel, a plate secured to the wall of said chamber to form, with said deflected portion, a flue in said hot-air space, said flue being spaced from said jacket and containing` openings at different elevations communieating with said chamberV and a third open ing adjacent the upper one of saidopenings, the furnace containing an outlet in comnunication with said third opening, the upper one of said iirst-referred-to openings forming, with said third opening in the flue, a passage from said chamber to said outlet for the relatively direct tra-vel of the products of combustion from said combustion chamber to said outlet and the lower one of said first-referred-to openings forming with said third opening, a passage for the relatively indirect passage of saidproducts to said outlet, and means whereby the products of combustion may be permitted to pass, under the control of the operator through either the upper or lower one of the iirst-referred-to openings.

3. In a hotair furnace, the combination of a combustion chamber, ajacket between which and the wall of said chamber a hotn air space is provided, the wall of said chamber being deflected laterally to form a channel, a plate secured to the wall of Saidv chamber to form, with said deflected portion, a flue in said hot-air space, said flue being in communication at its lower end with said chamber, the outlet of said flue being` above its inlet. n

4C. In a hotair furnace, the combination of a combustion chamber, a jacket between which and the wall of said chamber a hotair space is providedf the wall of said chamber being deflected laterally to form a channel, a plate secured to the wall of said chamber to form, with said deflected portion, a flue in said hot-air space, said flue containing openings at different elevations communicating with said chamber and the furnace being provided with an outlet communicating with said flue, the upper opening in said flue forming a passage from said chamber' to said outlet for the relatively direct travel of the products of combustion from said chamber to said outlet, and the lower opening in said flue forming a passage for the relatively indirect passage of said products to said outlet, a pipe section secured to said plate and communicating kwith the uppermost one of said first-referred-to openings and so constructed and arranged as to permit of either the direct or indirect passage referred to, and means, including a damper device in said pipe section, whereby the products of combustion may be permitted to pass, under the control of the operator, through either the upper or lower one of the first-referredto openings.

GEORGE H, HESS. 

